*
{
margin: 0;
padding: 0;
}

html, body
{
width: 100%;
height: 100%;
}

header, nav
{
background-color: white;
}

section
{
background-color: yellow;
height: 100%;
margin: 0;
}

article
{
width: 80%;
height: 100%;
float: left;
background-color: black;
}

aside
{
height: 100%;
background-color: grey;
}
